I did try the query in Force.com Explore and get the result whoever when I ran the test this error comes up.  Please help!!!
Here is my code:

@istest
private class QuoteProductEntryTests {

    static testMethod void theTests(){
      
          
        QuoteLineItem qli = [select Id, PricebookEntryId, PriceBookEntry.Product2Id, QuoteId, Quote.OpportunityId from QuoteLineItem limit 1];
             
              
        ////////////////////////////////////////
        //  test QuoteProductEntry
        ////////////////////////////////////////
      
        // load the page     
        PageReference pageRef = Page.QuoteProductEntry;
        pageRef.getParameters().put('Id',qli.QuoteId);
        Test.setCurrentPageReference(pageRef);
      
        // load the extension
        QuoteitemExtension oPEE = new QuoteItemExtension(new ApexPages.StandardController(qli.Quote));
      
        // test 'getChosenCurrency' method
        if(UserInfo.isMultiCurrencyOrganization())
            System.assert(oPEE.getChosenCurrency()!='');
        else
            System.assertEquals(oPEE.getChosenCurrency(),'');

        // we know that there is at least one line item, so we confirm
        Integer startCount = oPEE.ShoppingCart.size();
        system.assert(startCount>0);

        //test search functionality without finding anything
        oPEE.searchString = 'michaelforce is a hip cat';
        oPEE.updateAvailableList();
        system.assert(oPEE.AvailableProducts.size()==0);
      
        //test remove from shopping cart
        oPEE.toUnselect = qli.PricebookEntryId;
        oPEE.removeFromShoppingCart();
        system.assert(oPEE.shoppingCart.size()==startCount-1);
      
        //test save and reload extension
        oPEE.onSave();
        oPEE = new QuoteItemExtension(new ApexPages.StandardController(qli.Quote));
        system.assert(oPEE.shoppingCart.size()==startCount-1);
      
        // test search again, this time we will find something
        oPEE.searchString = qli.PricebookEntry.Name;
        oPEE.updateAvailableList();
        system.assert(oPEE.AvailableProducts.size()>0);     

        // test add to Shopping Cart function
        oPEE.toSelect = oPEE.AvailableProducts[0].Id;
        oPEE.addToShoppingCart();
        system.assert(oPEE.shoppingCart.size()==startCount);
              
        // test save method - WITHOUT quanitities and amounts entered and confirm that error message is displayed
        oPEE.onSave();
        system.assert(ApexPages.getMessages().size()>0);
      
        // add required info and try save again
        for(QuoteLineItem o : oPEE.ShoppingCart){
            o.quantity = 5;
            o.unitprice = 300;
        }
        oPEE.onSave();
      
        // query line items to confirm that the save worked
        QuoteLineItem[] qli2 = [select Id from QuoteLineItem where QuoteId = :qli.QuoteId];
        system.assert(qli2.size()==startCount);
      
        // test on new Opp (no pricebook selected) to make sure redirect is happening
        Quote newQuote = new Quote(Name='New quote', OpportunityId=qli.Quote.OpportunityId);
        insert(newQuote);
        oPEE = new QuoteItemExtension(new ApexPages.StandardController(newQuote));
        System.assert(oPEE.priceBookCheck()!=null);
      
        // final quick check of cancel button
        System.assert(oPEE.onCancel()!=null);
      
      
        ////////////////////////////////////////
        //  test redirect page
        ////////////////////////////////////////
      
        // load the page

   
    }
}